The angle between the rotating stator flux and rotor poles is called _____ angle.

What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?

A

The slip of the motor will be 5%

B

The rotor will not run

C

The rotor will run at very high speed

D

The torque produced will be very large

When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor

A

remains same as the original value

B

decreases to half the original value

C

tends to becomes zero

D

increases to two times the original value

In an induction motor the relationship between stator slots and rotor slots is that

A

Stator slots are equal to rotor slots

B

Stator slots are exact multiple of rotor slots

C

Stator slots are not exact multiple of rotor slots

D

None of the above

The stator is the rotating assembly in a generator or motor.

A

True

B

False

In direct cooled system using hydrogen both stator and rotor conductors are made

A

solid

B

hollow

C

perforated

D

any ofthe above

In which of the following motors the stator and rotor magnetic field rotate at the same speed ?

A

Universal motor

B

Synchronous motor

C

Induction motor

D

Reluctance motor

In which of the following motors the stator and rotor fields rotate simultaneously ?

A

D.C. motor

B

Reluctance motor

C

Universal motor

D

Synchronous motor

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as

A

locked-rotor torque

B

synchronous torque

C

pull up torque

D

reluctance torque

The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is

A

30 kW

B

20 kW

C

2 kW

D

4 kW

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of

A

zero degree

B

two degrees

C

five degrees

D

ten degrees

The angle between the rotating stator flux and rotor poles is called _____ angle.

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